fix: backend.Queue should accept a context #721

Job	Run time
ci (kubernetes, ./tests/bin/ci.sh -e 'test(7.\|8.)', ubuntu-latest)	2m 53s
ci (kubernetes, ./tests/bin/ci.sh -i 'test7.' -e 'test7(b.\|c.\|d.\|e.\|f.\|g.\|h.)', ubuntu-la...	7m 22s
ci (kubernetes, ./tests/bin/ci.sh -i 'test7(b.\|c.\|d.\|e.\|g.\|h.)', ubuntu-latest)	9m 9s
ci (kubernetes, ./tests/bin/ci.sh -i 'test7f.*', ubuntu-latest)	8m 14s
ci (kubernetes, ./tests/bin/ci.sh -i 'test8.*', ubuntu-latest)	4m 5s
ci (kubernetes, ./tests/bin/go.sh, ubuntu-latest)	2m 33s
ci (local, ./tests/bin/ci.sh -e 'test(7.\|8.)', ubuntu-latest)	1m 31s
ci (local, ./tests/bin/ci.sh -i 'test7.' -e 'test7(b.\|c.\|d.\|e.\|f.\|g.\|h.)', ubuntu-latest)	4m 30s
ci (local, ./tests/bin/ci.sh -i 'test7(b.\|c.\|d.\|e.\|g.\|h.)', ubuntu-latest)	7m 33s
ci (local, ./tests/bin/ci.sh -i 'test7f.*', ubuntu-latest)	6m 23s
ci (local, ./tests/bin/ci.sh -i 'test8.*', ubuntu-latest)	5s
ci (local, ./tests/bin/go.sh, ubuntu-latest)	2m 29s
	56m 47s

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